It's summer. Lakes and other waterways are warm ... and polluted with phosphorous and nitrogen. These conditions are ideal for overgrowth of blue-green algae. When this happens very potent toxins are released, potent enough to kill dogs. But people also take blue-green algae as a dietary supplement. What gives?
Lake Okeechobee, in South Florida, is being plagued by an enormous algae bloom. But what's causing the problem is not algae: it's a plant-like pathogen called cyanobacteria. Blooms from this type of bacteria are dangerous because they release a variety of deadly neurotoxins, which can kill humans and animals.